JP7326558B2 - Display device - Google Patents

Description

Embodiments of the present invention relate to display devices.

In recent years, various types of display devices have been proposed. A lighting device is disclosed that includes a light modulating layer containing optically anisotropic bulk and fine particles in a light modulating element adhered to a light guide plate. Another example discloses a light source device that includes a polymer-dispersed liquid crystal and has a light conversion section that converts the intensity of incident light. Still another example discloses a display device in which a light source and a light guide plate are attached to a frame and provided to the side of a liquid crystal panel.

JP 2010-92682 A JP 2016-57338 A WO2010/092791

An object of the present embodiment is to provide a display device capable of suppressing degradation of display quality.

According to this embodiment,
a first transparent substrate having a first main surface, a second transparent substrate having a first end and facing the first main surface, and positioned between the first transparent substrate and the second transparent substrate a liquid crystal layer containing linear polymers and liquid crystal molecules; a second end portion; and a second main surface opposite to the surface facing the second transparent substrate; a bonded third transparent substrate; a first surface facing the first main surface; a second surface opposite to the first surface; a third surface facing the second end; a light guide plate having a fourth surface opposite to the three surfaces; and a light emitting element facing the fourth surface, the first surface and the second surface being parallel, and the first main surface A display device is provided in which the height from the surface to the second surface is lower than the height from the first main surface to the second main surface .

FIG. 1 is a plan view showing one configuration example of the display device DSP of this embodiment. FIG. 2 is a cross-sectional view showing one configuration example of the display panel PNL shown in FIG. FIG. 3 is a perspective view showing the main parts of the display device DSP shown in FIG. FIG. 4 is an enlarged cross-sectional view of the extension Ex of the display device DSP shown in FIG. FIG. 5 is a cross-sectional view showing another configuration example of the display device DSP. FIG. 6 is a cross-sectional view showing another configuration example of the display device DSP. FIG. 7 is a cross-sectional view showing another configuration example of the display device DSP. FIG. 8 is a cross-sectional view showing another configuration example of the display device DSP. FIG. 9 is a cross-sectional view showing another configuration example of the display device DSP. FIG. 10 is a cross-sectional view showing another configuration example of the display device DSP. FIG. 11 is a cross-sectional view showing another configuration example of the display device DSP. FIG. 12 is a cross-sectional view showing another configuration example of the display device DSP. FIG. 13 is a plan view showing another configuration example of the display device DSP. FIG. 14 is a cross-sectional view of the display device DSP along line AB shown in FIG. FIG. 15 is a plan view showing another configuration example of the display device DSP. FIG. 16 is a cross-sectional view showing another configuration example of the display device DSP.

Hereinafter, this embodiment will be described with reference to the drawings. It should be noted that the disclosure is merely an example, and those skilled in the art will naturally include within the scope of the present invention any suitable modifications that can be easily conceived while maintaining the gist of the invention. In addition, in order to make the description clearer, the drawings may schematically show the width, thickness, shape, etc. of each part compared to the actual embodiment, but this is only an example and does not apply to the present invention. It does not limit interpretation. In addition, in this specification and each figure, the same reference numerals are given to components that exhibit the same or similar functions as those described above with respect to the previous figures, and duplicate detailed description may be omitted as appropriate. .

FIG. 1 is a plan view showing one configuration example of the display device DSP of this embodiment. In one example, the first direction X, the second direction Y, and the third direction Z are orthogonal to each other, but may intersect at an angle other than 90 degrees. The first direction X and the second direction Y correspond to directions parallel to the main surface of the substrate constituting the display device DSP, and the third direction Z corresponds to the thickness direction of the display device DSP. In this specification, the direction from the first substrate SUB1 to the second substrate SUB2 is referred to as "upper" (or simply "upper"), and the direction from the second substrate SUB2 to the first substrate SUB1 is referred to as "lower" (or simply "upper"). simply below). When "the second member above the first member" and "the second member below the first member" are used, the second member may be in contact with the first member or may be separated from the first member. may Further, it is assumed that an observation position for observing the display device DSP is located on the tip side of the arrow indicating the third direction Z, and from this observation position, the XY plane defined by the first direction X and the second direction Y is observed. Looking at the plane is called planar viewing.

In this embodiment, as an example of the display device DSP, a liquid crystal display device to which a polymer-dispersed liquid crystal is applied will be described. The display device DSP includes a display panel PNL, an IC chip 1 and a wiring substrate 2. As shown in FIG.

The display panel PNL includes a first substrate SUB1, a second substrate SUB2, a liquid crystal layer LC, and a seal SE. The first substrate SUB1 and the second substrate SUB2 are formed in a plate shape parallel to the XY plane. The first substrate SUB1 and the second substrate SUB2 overlap each other in plan view. The first substrate SUB1 and the second substrate SUB2 are bonded with a seal SE. The liquid crystal layer LC is held between the first substrate SUB1 and the second substrate SUB2 and sealed with a seal SE. In FIG. 1, the liquid crystal layer LC and the seal SE are indicated by different oblique lines.

As schematically shown in an enlarged manner in FIG. 1, the liquid crystal layer LC comprises polymer dispersed liquid crystal containing polymer 31 and liquid crystal molecules 32 . In one example, polymer 31 is a liquid crystalline polymer. The polymer 31 extends like a stripe. The extending direction D1 of the polymer 31 is parallel to the first direction X. As shown in FIG. The liquid crystal molecules 32 are dispersed in the interstices of the polymer 31 and oriented such that their long axes are along the first direction X. As shown in FIG. Each of the polymer 31 and liquid crystal molecules 32 has optical anisotropy or refractive index anisotropy. The responsiveness of the polymer 31 to an electric field is lower than the responsiveness of the liquid crystal molecules 32 to an electric field.
In one example, the orientation direction of the polymer 31 hardly changes regardless of the presence or absence of an electric field. On the other hand, the alignment direction of the liquid crystal molecules 32 changes according to the electric field when a voltage higher than the threshold is applied to the liquid crystal layer LC. When no voltage is applied to the liquid crystal layer LC, the optical axes of the polymer 31 and the liquid crystal molecules 32 are parallel to each other, and the light incident on the liquid crystal layer LC is hardly scattered within the liquid crystal layer LC. Transparent (transparent state). When a voltage is applied to the liquid crystal layer LC, the optical axes of the polymer 31 and the liquid crystal molecules 32 cross each other, and the light incident on the liquid crystal layer LC is scattered within the liquid crystal layer LC (scattering state).

The display panel PNL includes a display portion DA that displays an image, and a frame-shaped non-display portion NDA that surrounds the display portion DA. The seal SE is located in the non-display area NDA. The display section DA includes pixels PX arranged in a matrix in the first direction X and the second direction Y. As shown in FIG.

As shown enlarged in FIG. 1, each pixel PX includes a switching element SW, a pixel electrode PE, a common electrode CE, a liquid crystal layer LC, and the like. The switching element SW is composed of, for example, a thin film transistor (TFT), and is electrically connected to the scanning line G and the signal line S. The scanning line G is electrically connected to the switching element SW in each of the pixels PX arranged in the first direction X. As shown in FIG. The signal line S is electrically connected to the switching element SW in each of the pixels PX arranged in the second direction Y. As shown in FIG. The pixel electrode PE is electrically connected to the switching element SW. Each of the pixel electrodes PE faces the common electrode CE, and drives the liquid crystal layer LC (in particular, the liquid crystal molecules 32) by an electric field generated between the pixel electrode PE and the common electrode CE. The capacitor CS is formed, for example, between an electrode having the same potential as the common electrode CE and an electrode having the same potential as the pixel electrode PE.

The first substrate SUB1 has ends E11 and E12 extending along the first direction X and ends E13 and E14 extending along the second direction Y. As shown in FIG. The second substrate SUB2 has ends E21 and E22 extending along the first direction X and ends E23 and E24 extending along the second direction Y. As shown in FIG. In the illustrated example, the ends E12 and E22, the ends E13 and E23, and the ends E14 and E24 respectively overlap in plan view. The end E21 is positioned between the end E11 and the display section DA in plan view. The first substrate SUB1 has an extension Ex between the end E11 and the end E21.

The wiring board 2 is electrically connected to the extension Ex. The wiring board 2 is a bendable flexible printed circuit board. IC chip 1 is electrically connected to wiring board 2 . The IC chip 1 incorporates, for example, a display driver that outputs signals necessary for image display. Note that the IC chip 1 may be electrically connected to the extension Ex. The IC chip 1 and the wiring board 2 may read out signals from the display panel PNL, but mainly function as signal sources that supply signals to the display panel PNL.

FIG. 2 is a cross-sectional view showing one configuration example of the display panel PNL shown in FIG. The first substrate SUB1 includes a transparent substrate 10, insulating films 11 and 12, capacitor electrodes 13, switching elements SW, pixel electrodes PE, and an alignment film AL1. The first substrate SUB1 further includes the scanning lines G and signal lines S shown in FIG. The transparent substrate 10 has a main surface (lower surface) 10A and a main surface (upper surface) 10B opposite to the main surface 10A. The switching element SW is arranged on the main surface 10B. The insulating film 11 covers the switching element SW. A capacitive electrode 13 is positioned between the insulating films 11 and 12 . The pixel electrode PE is arranged for each pixel PX on the insulating film 12 . The pixel electrode PE is electrically connected to the switching element SW through the opening OP of the capacitor electrode 13 . The pixel electrode PE overlaps the capacitor electrode 13 with the insulating film 12 interposed therebetween to form the capacitor CS of the pixel PX. The alignment film AL1 covers the pixel electrode PE.

The second substrate SUB2 includes a transparent substrate 20, a light blocking layer BM, a common electrode CE, and an alignment film AL2. The transparent substrate 20 has a main surface (lower surface) 20A and a main surface (upper surface) 20B opposite to the main surface 20A. Principal surface 20A of transparent substrate 20 faces principal surface 10B of transparent substrate 10 . The light shielding layer BM and the common electrode CE are arranged on the main surface 20A. The light shielding layer BM is positioned, for example, directly above the switching element SW and directly above the scanning line G and the signal line S (not shown). The common electrode CE is arranged over a plurality of pixels PX and directly covers the light shielding layer BM. The common electrode CE is electrically connected to the capacitor electrode 13 and has the same potential as the capacitor electrode 13 . The alignment film AL2 covers the common electrode CE. The liquid crystal layer LC is positioned between the principal surface 10B and the principal surface 20A and is in contact with the alignment films AL1 and AL2. In the first substrate SUB1, the insulating films 11 and 12, the capacitive electrode 13, the switching element SW, the pixel electrode PE, and the alignment film AL1 are located between the main surface 10B and the liquid crystal layer LC. In the second substrate SUB2, the light blocking layer BM, common electrode CE, and alignment film AL2 are located between the main surface 20A and the liquid crystal layer LC.

The transparent substrates 10 and 20 are insulating substrates such as glass substrates and plastic substrates. The main surfaces 10A and 10B and the main surfaces 20A and 20B are surfaces substantially parallel to the XY plane. The insulating film 11 is made of a transparent insulating material such as silicon oxide, silicon nitride, silicon oxynitride, and acrylic resin. In one example, the insulating film 11 includes an inorganic insulating film and an organic insulating film. The insulating film 12 is an inorganic insulating film such as silicon nitride. The capacitive electrode 13, pixel electrode PE, and common electrode CE are transparent electrodes made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO). The light shielding layer BM is, for example, a conductive layer having a resistance lower than that of the common electrode CE. In one example, the light shielding layer BM is made of opaque metal material such as molybdenum, aluminum, tungsten, titanium, and silver. The alignment films AL1 and AL2 are horizontal alignment films having an alignment control force substantially parallel to the XY plane. In one example, the alignment films AL1 and AL2 are aligned along the first direction X. The alignment treatment may be a rubbing treatment or an optical alignment treatment.

FIG. 3 is a perspective view showing the main parts of the display device DSP shown in FIG. The display device DSP includes, in addition to the display panel PNL, a transparent substrate 30 and a light source unit LU1. The light source unit LU1 is positioned at the extension Ex. The transparent substrate 10, the transparent substrate 20, and the transparent substrate 30 are arranged along the third direction Z in this order.

The transparent substrate 30 is made of, for example, transparent glass or transparent resin such as polymethyl methacrylate (PMMA) or polycarbonate (PC). The transparent substrate 30 has a main surface (lower surface) 30A, a main surface (upper surface) 30B opposite to the main surface 30A, ends E31 and E32 extending in the first direction X, and It has ends E33 and E34 extending along it. Principal surface 30A faces principal surface 20B of transparent substrate 20 . In the illustrated example, the end E31 overlaps the end E21. Although the end E32 overlaps the end E22, it does not have to overlap.

The light source unit LU1 includes a plurality of light emitting elements LD1, a light guide plate LG1, and a wiring board F1. The plurality of light emitting elements LD1 are arranged at intervals along the extending direction D1 of the polymer 31 shown in FIG. A plurality of light emitting elements LD1 are connected to the wiring board F1. The light emitting element LD1 is positioned between the transparent substrate 10 and the wiring substrate F1. The light emitting element LD1 faces the end E21 of the transparent substrate 20 and the end E31 of the transparent substrate 30 . The light emitting element LD1 is, for example, a light emitting diode. The light emitted from the light emitting element LD1 travels along the direction of the arrow indicating the second direction Y. As shown in FIG.

The light guide plate LG1 is formed in a rectangular parallelepiped shape extending along the first direction X. As shown in FIG. The light guide plate LG1 is located between the transparent substrates 20 and 30 and the light emitting element LD1. The light guide plate LG1 has a surface 1A (lower surface), a surface (upper surface) 1B opposite to the surface 1A, a surface 1C, and a surface 1D opposite to the surface 1C. The surface 1A faces the transparent substrate 10, the surface 1B faces the wiring substrate F1, the surface 1C faces the plurality of light emitting elements LD1, and the surface 1D faces the transparent substrates 20 and 30. FIG. For example, each of the surfaces 1A and 1B is a flat surface parallel to the XY plane defined by the first direction X and the second direction Y. FIG. That is, planes 1A and 1B are parallel to each other. Each of the surfaces 1C and 1D is a flat surface parallel to the XZ plane defined by the first direction X and the third direction Z. The surfaces 1C and 1D may be uneven surfaces, and the surfaces 1C and 1D may not be parallel.

FIG. 4 is an enlarged cross-sectional view of the periphery of the extension portion Ex of the display device DSP shown in FIG. Note that only the main part of the display panel PNL is illustrated. The display device DSP further comprises an adhesive layer 40, an adhesive layer 50 and a transparent adhesive layer AD.

The first substrate SUB 1 further includes insulating films 14 and 15 and metal wiring 16 . Insulating film 14 is located on main surface 10B. The metal wiring 16 is located on the insulating film 14 and covered with the insulating film 15 . The insulating film 15 corresponds to the insulating film 11 or 12 shown in FIG. The metal wiring 16 is made of the same material as the scanning lines G or the signal lines S, for example.

The light emitting element LD1 has a light emitting portion EM1 facing the surface 1C of the light guide plate LG1. The light emitting part EM1 is spaced apart from the surface 1C. The light emitting section EM1 includes a red light emitting section, a green light emitting section, and a blue light emitting section. These color light-emitting portions are provided within the light-emitting portion EM1, but they are not necessarily positioned on the same straight line along the first direction X. As shown in FIG. In other words, these color light-emitting portions may be provided at positions with different heights along the third direction Z from the first substrate SUB1. The light emitting part EM1 is located between the surface 1A and the surface 1B of the first light guide plate LG1 in the third direction Z. As shown in FIG.

The adhesive layer 40 adheres the wiring board F1 and the light guide plate LG1 to form the light source unit LU1. In the illustrated example, the adhesive layer 40 is located between the surface 1B and the wiring board F1. The bonding layer 50 bonds the light source unit LU1 and the first substrate SUB1. In the illustrated example, the adhesive layer 50 is located between the surface 1A and the principal surface 10B and bonds the first light guide plate LG1 and the insulating film 15 together. The adhesive layer 40 has a reflective member M1, and the adhesive layer 50 has a reflective member M2. The reflecting member M1 is positioned between the wiring board F1 and the surface 1B. The reflecting member M2 is positioned between the insulating film 15 and the surface 1A. The adhesive layers 40 and 50 are, for example, laminates in which an adhesive, a reflective member, and an adhesive are laminated in this order. The adhesive layer 40 and the adhesive layer 50 are made of double-sided tape, for example. The reflecting members M1 and M2 are made of, for example, a highly reflective metal material such as aluminum, molybdenum, titanium, or silver. Incidentally, the reflecting members M1 and M2 may be light shielding members.

The transparent adhesive layer AD is located between the main surface 20B and the main surface 30A. The transparent adhesive layer AD is in contact with substantially the entire surface of each of the main surfaces 20B and 30A, and bonds the transparent substrates 20 and 30 together.

Here, attention is paid to the positional relationship among the light guide plate LG1, the transparent substrate 10, the transparent substrate 20, and the transparent substrate 30. FIG.
The transparent substrate 10 has a thickness T1, the transparent substrate 20 has a thickness T2, the transparent substrate 30 has a thickness T3, and the light guide plate LG1 has a thickness T10. In addition, the thickness in this specification corresponds to the length along the third direction Z. As shown in FIG. Thickness T1 corresponds to the distance from main surface 10A to main surface 10B, thickness T2 corresponds to the distance from main surface 20A to main surface 20B, and thickness T3 corresponds to the distance from main surface 30A to main surface 30B. and the thickness T10 corresponds to the distance from the surface 1A to the surface 1B. In the illustrated example, thickness T1 is equivalent to thickness T2, and thickness T3 is equivalent to thicknesses T1 and T2. Note that the thickness T3 may be different from the thicknesses T1 and T2. The thickness T10 is thicker than the thicknesses T1 to T3. A height H1 from the main surface 10B to the surface 1B is lower than a height H2 from the main surface 10B to the main surface 30B in the third direction Z. Also, the height H3 from the main surface 10B to the surface 1A is higher than the height H4 from the main surface 10B to the main surface 20A in the third direction Z. That is, the surface 1D is located between the main surface 20A and the main surface 30B in the third direction Z.

The light emitted from the light emitting part EM1 enters the light guide plate LG1 from the surface 1C, and travels through the light guide plate LG1 while being reflected by the surfaces 1A and 1B. The light traveling through the light guide plate LG1 is emitted from the surface 1D and enters the transparent substrate 20 and the transparent substrate 30 from the end E21 and the end E31.

According to this embodiment, the light guide plate LG1 has the surface 1D in the third direction Z at a position lower than the main surface 30B. Therefore, most of the light that has traveled through the light guide plate LG1 is guided to the ends E21 and E31 and contributes to the display on the display panel PNL, thereby suppressing a decrease in light incidence efficiency.

Also, the reflecting member M1 is positioned between the surface 1B and the wiring board F1. Of the light traveling through the light guide plate LG1, the light transmitted through the surface 1B is reflected by the reflecting member M1 and does not reach the wiring board F1. Accordingly, it is possible to prevent the light traveling through the light guide plate LG1 from being colored by the wiring board F1. Also, the reflecting member M2 is positioned between the surface 1A and the metal wiring 16. As shown in FIG. Of the light traveling through the light guide plate LG1, the light transmitted through the surface 1A is reflected by the reflecting member M2 and does not reach the metal wiring 16. FIG. As a result, the light traveling through the light guide plate LG<b>1 can be prevented from being undesirably scattered by the metal wiring 16 . Therefore, deterioration in display quality can be suppressed.

Furthermore, the wiring board F1 connected to the light emitting element LD1 is adhered to the light guide plate LG1 via the adhesive layer 40, and the light guide plate LG1 is adhered to the insulating film 15 via the adhesive layer 50. Thereby, the optical unit LU1 can be fixed to the first substrate SUB1 without providing a frame for fixing the optical unit LU1, and the weight of the display device DSP can be reduced.

In the example shown in FIG. 4, the transparent substrates 10 to 30 correspond to the first transparent substrate to the third transparent substrate, respectively, the light emitting element LD1 corresponds to the first light emitting element, and the light guide plate LG1 corresponds to the first light guide plate. The wiring board F1 corresponds to the first wiring board, the adhesive layer 40 corresponds to the first adhesive layer, the adhesive layer 50 corresponds to the second adhesive layer, the main surface 10B corresponds to the first main surface, The main surface 30B corresponds to the second main surface, the end E21 corresponds to the first end, the end E31 corresponds to the second end, the surface 1A corresponds to the first surface, and the surface 1B corresponds to the first surface. Equivalent to two sides.

FIG. 5 is a cross-sectional view showing another configuration example of the display device DSP. The configuration example shown in FIG. 5 differs from the configuration example shown in FIG. 4 in that the length L1 along the second direction Y from the surface 1C to the surface 1D is longer. It is desirable that the length L1 is, for example, 20 mm or more. Length L1 is longer than length L2 from end E11 to end E21. The end E11 is located between the surface 1C and the ends E21 and E31 in the second direction Y. As shown in FIG. The surface 1A is in contact with the air layer in the area NA that is not in contact with the adhesive layer 50 . Therefore, of the light traveling in the light guide plate LG1, the light traveling to the area NA is reflected at the interface with the air layer.
Even in such a configuration example, the same effects as in the configuration example shown in FIG. 4 can be obtained. Additionally, the length L1 is 20 mm or more. Therefore, the distances from the light emitting part EM1 to the end E21 and the end E31 become long, so the light emitted from the light emitting part EM1 mixes with each other while traveling through the light guide plate LG1. As a result, deterioration in display quality due to unevenness in illumination light can be suppressed.
In the example shown in FIG. 5, the surface 1D corresponds to the third surface and the surface 1C corresponds to the fourth surface.

FIG. 6 is a cross-sectional view showing another configuration example of the display device DSP. The configuration example shown in FIG. 6 differs from the configuration example shown in FIG. 4 in that the wiring board F1 is positioned between the light guide plate LG1 and the transparent substrate 10. In FIG. The adhesive layer 40 is located between the surface 1A and the wiring board F1. The adhesive layer 40 has a reflective member M1. The adhesive layer 50 is located between the insulating film 15 and the wiring substrate F1. In the illustrated example, the adhesive layer 50 does not include a reflective member. The light guide plate LG1 is in contact with the air layer on the surface 1B.
Even in such a configuration example, the same effects as in the configuration example shown in FIG. 4 can be obtained. In addition, since the surface 1B is in contact with the air layer, the light is not absorbed by other members on the surface 1B. can suppress the decrease in

FIG. 7 is a cross-sectional view showing another configuration example of the display device DSP. The configuration example shown in FIG. 7 differs from the configuration example shown in FIG. 4 in that the light source unit LU1 overlaps the main surface 30A. The end E32 does not overlap the end E12 and the end E22. The light emitting element LD1 faces the ends E12 and E22. The adhesive layer 50 bonds the light guide plate LG1 and the transparent substrate 30 together. The adhesive layer 50 is located between the surface 1A and the main surface 30A. The reflecting member M2 is positioned between the surface 1A and the main surface 30A. The light guide plate LG1 overlaps the main surface 30A and is positioned between the ends E12 and E22 and the light emitting element LD1. A height H5 from the main surface 30A to the surface 1B is lower in the third direction Z than a height H6 from the main surface 30A to the main surface 10A. A height H7 from the main surface 30A to the surface 1A is higher in the third direction Z than a height H8 from the main surface 30A to the main surface 20B. In other words, the surface 1D is located between the main surface 20B and the main surface 10A in the third direction Z.

Even in such a configuration example, the same effects as in the configuration example shown in FIG. 4 can be obtained.
In the example shown in FIG. 7, the end E12 corresponds to the first end, the end E22 corresponds to the second end, the main surface 10A corresponds to the first main surface, and the main surface 10B corresponds to the second main surface. It corresponds to the main surface, and the main surface 30A corresponds to the third main surface.

FIG. 8 is a cross-sectional view showing another configuration example of the display device DSP. The configuration example shown in FIG. 8 differs from the configuration example shown in FIG. 6 in that the light source unit LU1 overlaps the main surface 30A. The wiring board F1 is located between the light guide plate LG1 and the transparent substrate 30. As shown in FIG. The adhesive layer 50 is located between the wiring board F1 and the transparent substrate 30 .
Even in such a configuration example, the same effects as in the configuration example shown in FIG. 6 can be obtained.

FIG. 9 is a cross-sectional view showing another configuration example of the display device DSP. The configuration example shown in FIG. 9 differs from the configuration example shown in FIG. 4 in that the display device DSP includes a light source unit LU2. The light source unit LU2 has the same structure as the light source unit LU1 shown in FIG. The light source unit LU2 includes a plurality of light emitting elements LD2, a light guide plate LG2, and a wiring board F2.

The light emitting element LD2 faces the end E12 of the transparent substrate 10 and the end E22 of the transparent substrate 20 . The light emitted from the light emitting part EM2 of the light emitting element LD2 travels in the direction opposite to the direction of the arrow indicating the second direction Y. As shown in FIG. A plurality of light emitting elements LD2 are connected to the wiring substrate F2. The adhesive layer 60 bonds the wiring board F2 and the light guide plate LG2. The adhesive layer 60 has a reflective member M3. The adhesive layer 70 bonds the light guide plate LG2 and the transparent substrate 30 together. The adhesive layer 70 has a reflective member M4. The light guide plate LG2 has a surface 2A (upper surface), a surface (lower surface) 2B opposite to the surface 2A, a surface 2C, and a surface 2D opposite to the surface 2C. The surface 2A faces the transparent substrate 30, the surface 2B faces the wiring board F2, the surface 2C faces the light emitting element LD2, and the surface 2D faces the transparent substrate 10 and the transparent substrate 20. FIG. Surface 2A and surface 2B are parallel to each other. A height H5 from the main surface 30A to the surface 2B is lower in the third direction Z than a height H6 from the main surface 30A to the main surface 10A.

In the example shown in FIG. 9, the light emitting element LD2 corresponds to the second light emitting element, the light guide plate LG2 corresponds to the second light guide plate, the wiring substrate F2 corresponds to the second wiring substrate, and the adhesive layer 60 corresponds to the third wiring substrate. The adhesive layer 70 corresponds to the fourth adhesive layer, the principal surface 10A corresponds to the third principal surface, the principal surface 30A corresponds to the fourth principal surface, and the surface 2A corresponds to the fifth surface. The surface 2B corresponds to the sixth surface, the end E12 corresponds to the third end, and the end E22 corresponds to the fourth end.

FIG. 10 is a cross-sectional view showing another configuration example of the display device DSP. The configuration example shown in FIG. 10 differs from the configuration example shown in FIG. 9 in that the wiring board F2 is positioned between the light guide plate LG2 and the transparent substrate 30. In FIG. The light source unit LU2 has the same structure as the light source unit LU1 shown in FIG. The adhesive layer 60 has a reflective member M3. The adhesive layer 70 bonds the wiring substrate F2 and the transparent substrate 30 together. In the illustrated example, the adhesive layer 70 is located between the main surface 30A and the wiring substrate F2. The surface 2B of the light guide plate LG2 is in contact with the air layer.

FIG. 11 is a cross-sectional view showing another configuration example of the display device DSP. The configuration example shown in FIG. 11 differs from the configuration example shown in FIG. 9 in that the light source unit LU1 has the same structure as the light source unit LU1 shown in FIG.

FIG. 12 is a cross-sectional view showing another configuration example of the display device DSP. The configuration example shown in FIG. 12 differs from the configuration example shown in FIG. 11 in that the light source unit LU2 has the same structure as the light source unit LU1 shown in FIG.

The configuration examples shown in FIGS. 9 to 12 also provide the same effects as the configuration examples described above. In addition, since the light emitted from the light emitting part EM2 is incident from the end E12 and the end E22, the amount of light incident on the display panel PNL is increased. As a result, even if the display panel PNL is enlarged and the display area DA is enlarged, a decrease in luminance can be suppressed over the entire area of the display area DA, and a decrease in display quality can be suppressed.

FIG. 13 is a plan view showing another configuration example of the display device DSP. 13 is different from the configuration example shown in FIG. 9 in that the transparent substrate 30 extends in the first direction X and the light source unit LU1 is positioned between the end E23 and the end E33. , in that the light source unit LU2 is positioned between the end E24 and the end E34. In the illustrated example, the extension direction D1 of the polymer 31 is parallel to the second direction Y. As shown in FIG. The end E33 does not overlap the end E13 and the end E23. The end E34 does not overlap the end E14 and the end E24.

The light emitting elements LD1 are arranged at intervals along the extension direction D1 of the polymer 31 . The light guide plate LG1 is positioned between the light emitting element LD1 and the end E23 and extends along the second direction Y. As shown in FIG. The light emitting elements LD2 are arranged along the extension direction D1 of the polymer 31 at intervals. The light guide plate LG2 is positioned between the light emitting element LD2 and the end E24 and extends along the second direction Y. As shown in FIG.

FIG. 14 is a cross-sectional view of the display device DSP along line AB shown in FIG. In the illustrated example, the light source units LU1 and LU2 have the same structure as the light source unit LU1 shown in FIG. 7, but may have the same structure as the light source unit LU1 shown in FIG. Light source unit LU1 and light source unit LU2 overlap main surface 30A.

The light emitting element LD1 faces the end E13 of the transparent substrate 10 and the end E23 of the transparent substrate 20. As shown in FIG. Light emitted from the light emitting part EM1 of the light emitting element LD1 travels in the direction of the arrow indicating the first direction X. As shown in FIG. A surface 1D of the light guide plate LG1 faces the end E13 and the end E23. The light emitted from the light emitting part EM1 travels through the light guide plate LG1 and enters the transparent substrate 10 and the transparent substrate 20 from the end E13 and the end E23. The light emitting element LD2 faces the end E14 of the transparent substrate 10 and the end E24 of the transparent substrate 20. As shown in FIG. The light emitted from the light emitting part EM2 of the light emitting element LD2 travels in the direction opposite to the direction of the arrow indicating the first direction X. As shown in FIG. A surface 2D of the light guide plate LG2 faces the end E14 and the end E24. The light emitted from the light emitting part EM2 travels through the light guide plate LG2 and enters the transparent substrate 10 and the transparent substrate 20 from the end E14 and the end E24.
Even in such a configuration example, the same effects as in the configuration example shown in FIG. 9 can be obtained.

FIG. 15 is a plan view showing another configuration example of the display device DSP. Compared to the configuration example shown in FIG. 9, the configuration example shown in FIG. 15 has the transparent substrate 30 extending along the first direction X and the second direction Y, respectively, and the display device DSP having the light source units LU3 and LU4. It is different in that it has In the illustrated example, the extending direction D1 of the polymer 31 is a direction intersecting the first direction X and the second direction Y, respectively. The end E33 does not overlap the end E13 and the end E23. The end E34 does not overlap the end E14 and the end E24. The light source units LU3 and LU4 have the same structure as the light source units LU1 and LU2 shown in FIG.
Even in such a configuration example, the same effects as in the configuration example shown in FIG. 9 can be obtained. In addition, the light emitted from the light emitting element LD3 enters from the ends E13 and E23, and the light emitted from the light emitting element LD4 enters from the ends E14 and E24. more light.

FIG. 16 is a cross-sectional view showing another configuration example of the display device DSP. The configuration example shown in FIG. 16 differs from the configuration example shown in FIG. 4 in that the transparent substrate 30 is not provided and the transparent substrate 20 has a thickness T20. Thickness T20 corresponds to the distance from main surface 20A to main surface 20B. In the illustrated example, thickness T20 is thicker than each of thickness T10 and thickness T1. A height H1 from the main surface 10B to the surface 1B is lower than a height H9 from the main surface 10B to the main surface 20B in the third direction Z. In other words, the surface 1D is located between the main surface 20A and the main surface 20B in the third direction Z. Light emitted from the light emitting part EM1 travels through the light guide plate LG1, is emitted from the surface 1D, and enters the transparent substrate 20 from the end E21. The light source unit LU1 has the same structure as the light source unit LU1 shown in FIG. 4, but may have the same structure as the light source unit LU1 shown in FIGS.

Even in such a configuration example, the same effects as in the configuration example shown in FIG. 4 can be obtained. In addition, when the light emitted from the light emitting element LD1 travels through the light guide plate LG1 and is incident on the bonding member, the edge of each member facing the surface 1D is caused by misalignment between the members. If the portions are misaligned, there is a risk that the light incidence efficiency from the light emitting element LD1 to the display panel PNL will be lowered. On the other hand, in the configuration example shown in FIG. 16, the light emitted from the light emitting element LD1 travels through the light guide plate LG1 and is incident on the single transparent substrate 20. Therefore, the light emitted from the light emitting element LD1 reaches the display panel PNL. It is possible to suppress the decrease in the light incidence efficiency.
In the example shown in FIG. 16, main surface 20B corresponds to the second main surface.

As described above, according to this embodiment, it is possible to provide a display device capable of suppressing degradation in display quality.

It should be noted that although several embodiments of the invention have been described, these embodiments are provided by way of example and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and its equivalents.

The invention described in the original application of the present application is additionally described below.
[1] A first transparent substrate having a first main surface;
a second transparent substrate having a first end and facing the first main surface;
a liquid crystal layer located between the first transparent substrate and the second transparent substrate and containing linear polymers and liquid crystal molecules;
a third transparent substrate having a second end and a second main surface opposite to the surface facing the second transparent substrate and bonded to the second transparent substrate;
a first light emitting element facing the first end and the second end;
a first light guide plate superimposed on the first main surface and positioned between the first end portion and the second end portion and the first light emitting element;
The first light guide plate has a first surface facing the first main surface and a second surface opposite to the first surface,
The display device, wherein the height from the first main surface to the second surface is lower than the height from the first main surface to the second main surface.
[2] The display device according to [1], wherein the first surface and the second surface are parallel.
[3] Further, a first wiring board connected to the first light emitting element and facing the second surface;
a first adhesive layer that bonds the first wiring board and the first light guide plate;
an insulating film positioned between the first main surface and the first light guide plate;
a second adhesive layer that bonds the insulating film and the first light guide plate;
The display device according to [2], wherein the first adhesive layer and the second adhesive layer include a reflective member.
[4] The first light guide plate has a third surface facing the first end portion and the second end portion, and a fourth surface opposite to the third surface and facing the first light emitting element. and
The display device according to [3], wherein the distance between the third surface and the fourth surface is 20 mm or more.
[5] Further, a first wiring board connected to the first light emitting element and positioned between the first light guide plate and the first main surface;
an insulating film positioned between the first main surface and the first wiring substrate;
a first adhesive layer that bonds the first wiring board and the first light guide plate;
a second adhesive layer that bonds the first wiring board and the insulating film;
The display device according to [2], wherein the first adhesive layer includes a reflective member, and the second surface is in contact with an air layer.
[6] The first transparent substrate has a third main surface opposite to the first main surface and a third end,
the second transparent substrate has a fourth end opposite the first end;
The third transparent substrate has a fourth main surface opposite to the second main surface,
Further, a second light emitting element facing the third end and the fourth end;
a second light guide plate superimposed on the fourth main surface and positioned between the third end and the fourth end and the second light emitting element;
The second light guide plate has a fifth surface facing the fourth main surface and a sixth surface opposite to the fifth surface,
The display device according to any one of [1] to [5], wherein the height from the fourth main surface to the sixth surface is lower than the height from the fourth main surface to the third main surface.
[7] The display device according to [6], wherein the fifth surface and the sixth surface are parallel.
[8] Further, a second wiring board connected to the second light emitting element and facing the sixth surface;
a third adhesive layer that bonds the second wiring board and the second light guide plate;
a fourth adhesive layer for bonding the second light guide plate and the third transparent substrate;
The display device according to [7], wherein the third adhesive layer and the fourth adhesive layer include a reflective member.
[9] Further, a second wiring board connected to the second light emitting element and positioned between the second light guide plate and the fourth main surface;
a third adhesive layer that bonds the second wiring board and the second light guide plate;
a fourth adhesive layer for bonding the second wiring substrate and the third transparent substrate;
The display device according to [7], wherein the third adhesive layer includes a reflective member, and the sixth surface is in contact with an air layer.
[10] A first transparent substrate having a first end, a first main surface, and a second main surface opposite to the first main surface;
a second transparent substrate having a second end and facing the second main surface;
a liquid crystal layer located between the first transparent substrate and the second transparent substrate and containing linear polymers and liquid crystal molecules;
a third transparent substrate having a third main surface adhered to the second transparent substrate;
a first light emitting element facing the first end and the second end;
a first light guide plate superimposed on the third main surface and positioned between the first end portion and the second end portion and the first light emitting element;
The first light guide plate has a first surface facing the third main surface and a second surface opposite to the first surface,
The display device, wherein the height from the third main surface to the second surface is lower than the height from the third main surface to the first main surface.
[11] A first substrate comprising a first transparent substrate;
a second substrate comprising a second transparent substrate having a first end;
a liquid crystal layer located between the first transparent substrate and the second transparent substrate and containing linear polymers and liquid crystal molecules;
a third transparent substrate having a second end and adhered to the second transparent substrate;
and a light source unit superimposed on the first substrate,
The light source unit
a first light emitting element facing the first end and the second end;
a first light guide plate positioned between the first and second ends and the first light emitting element;
a first wiring board connected to the first light emitting element;
a first adhesive layer that bonds the first wiring board and the first light guide plate;
A display device comprising: a second adhesive layer for bonding the first substrate and the first light guide plate.
[12] A first transparent substrate having a first main surface;
a second transparent substrate having a first end and a second main surface opposite to the surface facing the first transparent substrate;
a liquid crystal layer located between the first transparent substrate and the second transparent substrate and containing linear polymers and liquid crystal molecules;
a first light emitting element facing the first end;
a first light guide plate superimposed on the first main surface and positioned between the first end and the first light emitting element;
The first light guide plate has a first surface facing the first main surface and a second surface opposite to the first surface,
The display device, wherein the height from the first main surface to the second surface is lower than the height from the first main surface to the second main surface.

DSP...display device PNL...display panel 10, 20, 30...transparent substrate LG...light guide plate LD...light emitting element M...adhesive layer F...wiring board

Claims (4)

a first transparent substrate having a first main surface;
a second transparent substrate having a first end and facing the first main surface;
a liquid crystal layer located between the first transparent substrate and the second transparent substrate and containing linear polymers and liquid crystal molecules;
a third transparent substrate having a second end and a second main surface opposite to the surface facing the second transparent substrate and bonded to the second transparent substrate;
a first surface facing the first principal surface, a second surface opposite the first surface, a third surface facing the second end, and a fourth surface opposite the third surface and a light guide plate having
a light emitting element facing the fourth surface,
the first surface and the second surface are parallel,
The height from the first main surface to the second surface is lower than the height from the first main surface to the second main surface,
display device. a wiring substrate connected to the light emitting element and facing the second surface;
a first adhesive layer that bonds the wiring board and the light guide plate;
an insulating film positioned between the first main surface and the light guide plate;
a second adhesive layer that bonds the insulating film and the light guide plate,
2. The display device according to claim 1, wherein said first adhesive layer and said second adhesive layer comprise a reflective member. 3. The display device according to claim 2, wherein the distance between said third surface and said fourth surface of said light guide plate is 20 mm or more. a wiring board connected to the light emitting element and positioned between the light guide plate and the first main surface;
an insulating film positioned between the first main surface and the wiring substrate;
a first adhesive layer that bonds the wiring board and the light guide plate;
a second adhesive layer that bonds the wiring substrate and the insulating film;
2. The display device according to claim 1, wherein said first adhesive layer comprises a reflective member, and said second surface is in contact with an air layer.

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